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The research in nanocrystal materials has intensified in the last years, primarily due to their attractive potential, i.e. properties which are significantly improved compared to large grain materials [Karch, et al., 1987; Milosevic, 1999; Ristic, 2003]. Nanostructure materials rank in the group of ultrafine metastable structures which contain a high defect concentration (spotted defects, dislocations, grain boundaries, interphase boundaries, etc). These materials are structurally different from crystal and amorphous forms, due to the fact that grain boundaries and the interphase represent a specific condition of the solid matter, since the atoms on the boundary are subject to a periodical potential field of crystal from both sides of the boundary [Milosevic, 1999]. Nanostructural materials can be synthesized in controlled processes by the following methods: highly energetic reactive milling [Ahn, 1996], solution precipitation (sol-gel [Ruys & Mai, 1999], hydrothermal synthesis [Byrappaa & Adschirib, 2007], electrochemical synthesis [Yuana et al., 2007]), internal oxidation [Afshar & Simchi, 2008] etc. The synthesis of nanoparticles is generally performed by the methods of "from the bottom to the top approach" ("bottom-up approach"), such as the deposition from the gas or liquid phase, thermal decomposition (evaporation-condensation), and the methods based on "from the top to the bottom approach" ("top-down approach"), wherein mechanical grinding processes are distinctive. When using the bottom-up method, nanoparticles are formed atom by atom or molecule by molecule, whereas when using the top-down approach, large volumes are gradually reduced in proportion to reach the nanometer dimensions [Hosokawa, 2007]. The synthesis of metal and alloy powders represents the starting stage in the production of sintered metal materials. For obtaining sintered products with the required properties, the starting material, powders of metals or alloys, are of decisive importance. Since the starting structure undergoes certain changes in further processing, but, basically, remains preserved in the structure of the final product [Anđic, 2007; Ristic, 2003], there is an increased necessity for a larger number of methods for producing powders. Although obtaining powders by a thermochemical method, where the input materials are in liquid phase, is not a new

Synthesis and Characterization of Dispersion Reinforced Sintered System Based on Ultra Fine and Nanocomposite Cu-Al2O3 Powders